As with many other faults, the causes of high idling of the engine should be sought from simple to complex. In fact, the reasons for these can be quite a few, but among them you can allocate the most common:
- large idling due to air supply with collector (with the subsequent hit in the engine);
- increased costs at idle due to leakage in a vacuum line;
- high speed at idle due to the malfunction of the ignition system Engine.
As you can see, these reasons are quite "smeared", and they should be specified. But the first thing you need to do is the standard procedure - to drown out the car, remove the negative battery terminal for 15-20 seconds, then connect it back and check whether the problem remains.
High idle engine speed due to air supply and vacuum line leakage
So, if the cause of high idling has become an excessive air from entering the engine, then the cable should be checked here first. throttle valve. Because of it, the flap can remain unnecessarily open at idle, as a result of which the latter grow. This happens, since the "brains" of the engine see that there is a lot of air (more precisely, oxygen) comes into the collector, and therefore adjust the fuel supply, increasing it. As a result, the engine is growing at idle. Assist in this case can clean the throttle with special chemicals.
More air in the collector can also flow due to disruption of tightness in the air intake system. In this case, you should check all vacuum highways, the heads of the heads and all areas of the air traffic in the engine to suck air. Listen to hissing sounds, which can be a key indicator of vacuum leakage and air suction.
Increased idling due to problems in the ignition system
In this case, the reason lies in one of the parts of the ignition system - also a fairly frequent reason for the problem with turns. It should be checked here and, if necessary, replace the distributor cover, ignition wires or elementary spark plugs.
Other reasons for elevated idolock turns and solutions methods:
- Sensor idle move . In principle, this malfunction should be included in the list of distributed ...
- Fuel pressure control It can work with too low pressure. Check the fuel pressure using a special pressure gauge to check the fuel pressure. Replace the fuel pressure regulator if necessary (not independent work For many drivers).
- Incorrectly established or shot down ignition advance angle (In this case, idle turns usually increase not strongly).
- The reason may be fault in a computerized management system Engine. You should read errors using a diagnostic instrument to identify the problem.
- Generator Also sometimes causes high idle speeds. If it works incorrectly and generates not enough current, the engine will try to unwind it even stronger to balance the voltage.
- If you know what looks like and where is PCV valve and its hose, then inspect them. With the help of pliers, overcover the hose of this valve. The frequency of engine revolutions must decrease a little. If this does not happen, then the reason for the increased rotor of the motor is precisely faulty valve - You need to replace it.
- Overheating of the engine or a faulty sensor of its temperature in rare cases can also cause larger speed at idle.
description
The procedure is the operation of learning the ECM unit of air supply at idle turnover, in which the engine turnover is maintained within the normal range. It must be performed in the following cases:
When replacing the throttle electric drive or ECM block;
When the frequency is turning H.H. or the ignition advance angle differs from the norm.
1. Preparation
Before performing the procedure for training air supply at the turns of H.H. Make sure the following conditions are followed. The learning procedure is canceled if one of them is not respected at least for a moment.
Battery voltage: more than 12.9 V (on the turns of H.Kh.);
Engine coolant temperature: 70-100 "C;
PNP switch in the "ON" position;
Electrical Load Switch: In Position "OFF" (air conditioning, headlights, rear window heater).
On cars equipped with a daytime lighting system, set the light switch to the 1st position to include only small lanterns.
Steering wheel: in a neutral position (corresponding to rectilinear movement);
Car speed: car stands;
Transmission: Fire;
On models with variator and MKP:
Take a trip by car for 10 minutes.
2. Implementation procedure
If an accelerator pedal position sensor circuit has a malfunction, the switching to the diagnostic mode is not possible.
1. Follow the procedure for learning the accelerator pedal position. See above.
2. Perform the procedure for learning the closed position of the throttle. See above.
3. Start the engine and warm it up to normal temperatures.
4. Turn the ignition key to the "OFF" position and leaving at least 10 seconds.
5. Make sure the accelerator pedal is completely released, turn the ignition key to the "ON" position and you will wait 3 seconds.
6. Quickly five times within 5 seconds, repeat the following procedure:
Fully click on the accelerator pedal.
Completely release the accelerator pedal.
7. Look out 7 seconds, fully press the accelerator pedal and hold it approx. 20 seconds, while the MI fault indicator does not stop flashing and light up with a stable light.
8. Fully release the accelerator pedal within 3 seconds after sunbathing the malfunction indicator "M |"
9. Run the engine and let it work on the turns of H.H.
10. Look out 20 seconds.
Go to clause 3.
3. Check the speed of H.Kh. and ignition advance angle
Force the engine two or three times and make sure that the frequency is turning H.H. And the ignition advance angle is normal.
The results of the inspection are normal?
Yes -\u003e End of verification.
No -\u003e Go to clause 4.
4. Determine the faulty component
Check the following:
Check if the throttle valve is completely closed.
Check the PCV valve operation.
Check if there is no air leakage behind the throttle.
The results of the inspection are normal?
Yes -\u003e Go to clause 5.
No -\u003e Repair or replace the faulty component.
5. Determine the faulty component
Engine components and status of their installation cause doubts. Check and correct the flaws.
If after starting the engine, one of the following states occurs, eliminate the cause of the malfunction and re-conduct the procedure for training the air at idle turns from the very beginning:
The engine stalls;
Unstable work on the turns of H.H.
End of verification.
All motorists sometimes encounter such a problem as increased idling speed. But, unfortunately, the novice requires a considerable time to find and eliminate this problem without a visit to a specialized car service. To do this, you need a detailed guide in which all necessary actions will be specifically described.
When starting the engine can gain higher speed for accelerated warm-up. This is especially manifested in winter. But after a while, after reaching the minimum operating temperature, an electronic control unit is triggered, which reduces the engine revolutions to normal value. If this does not happen, then it is necessary to urgently search for the reasons that cause this problem.
Increased turnoves indicate more intensive engine operation, which can lead to a variety of consequences. For long operation It can significantly increase the engine temperature, which will lead to a thermal impact. This will lead to a cylinder block. In addition, most of the nodes will receive strong work out due to the unstable engine operation and as a result, the accelerated wear. All this will affect the resource of the engine.
Therefore, it is necessary to immediately understand what reason caused an increase in revolutions. There are several of them:
- idle operation sensor
- problems with angle adjustment in throttle
- engine temperature sensor failure
- air entering the damaged intake manifold
- problems with electronic block Control
Methods of solving problems
Diagnosis of this problem requires some knowledge, since in the process can be affected by irreparable damage to the engine. Therefore, it is necessary to carefully read the operating instructions this car. It is also important to remember that the Niva Chevrolet is installed on the car gasoline engines Injector type, therefore, elevated idling turns on a heated engine are caused by most likely electronic components of the car.
Checking the idle sensor
For this, the engine warms up to operating temperature. Then only to check the sensor using a multimeter. When malfunction must be replaced with a new one.
Throttle position sensor
This component is responsible for the amount of air mixture entering the engine combustion chamber. If the sensor is configured incorrectly, the fuel granted fuel will be harder to detonate, quickly spinning the engine and increasing turns. Checking the sensor is also made using a multimeter.
Problems with throttle valve.
These problems are similar to the failure of the throttle sensor and lead to the same consequences. Only the main problem here is not electronic - and pollution of the damper itself falling out of crankcase with oils, residues of combustion products or due to a rare change air filter. If there are pollution trails, you must clean the damper. To do this, you need to completely remove the throttle knot and either replace it with damage or clean using special Tools. It is important to remember that after cleaning, an angle of throttle valve may be invalid, due to the so-called "memory effect" in the ECU. In this case, on some models it will be necessary to conduct additional computer diagnostics.
Engine temperature sensor.
This component is most often conclusing because it is constantly exposed to highly high temperatures. Therefore, in some cases it is better to start finding problems with it. It is also checked using a multimeter. After replacement, it may be necessary to clean the ECU errors.
Damage to the intake manifold.
It may fail and the collector himself, if the car has a sufficiently large resource. But more often fails. In this case, excess air superstar occurs. To solve the problem, it is necessary to dismantle this item, as well as the nodes on which injection elements are located. Before installing the gasket, it is necessary to carefully polish the surface of the collector and clean it from the traces of the old gasket. But it is important to remember that the emergence of this problem is accompanied by not only increased turnover at idle. Damage to the gasket leads to the fact that the engine launch becomes complicated, turns at the time of movement.
As can be seen from practice, there are a very large number of problems that can cause increased idling turnover on a heated engine. So if there are doubts that dIY repair It will not bring the desired result better to entrust the car to specialists who, with the help of professional equipment, will be able to reveal the defect and eliminate it faster.
Why in Niva Chevrolet There are increased irrigates of idling on a heated engine, all motorists sometimes face such a problem as increased idle speed. But, unfortunately, the novice requires a considerable time to find and eliminate this problem without a visit to a specialized car service. To do this, you need a detailed guide in which all necessary actions will be specifically described.
Contents 1 Main reasons 2 Ways to solve problems 3 Checking no power sensor 4 Throttle position sensor 5 Problems with throttle stroke. 6 Engine temperature sensor. 7 damage to the intake manifold. The main reasons for starting the engine can gain higher speed for accelerated warm-up. Especially often it is manifested in winter. But after a while, after reaching the minimum operating temperature, an electronic control unit is triggered, which reduces the engine revolutions to normal value. If this does not happen, then it is necessary to urgently search for the reasons that cause this problem. Increased turnoves indicate more intensive engine operation, which can lead to a variety of consequences. With long-term operation, the engine temperature can significantly increase, which will lead to a thermal impact. This will lead to a cylinder block. In addition, most of the nodes will receive strong work out due to the unstable engine operation and as a result, the accelerated wear. All this will affect the resource of the engine. Therefore, it is necessary to immediately understand what reason caused an increase in revolutions. There are several of them: idling operation sensor Throttle sensor Problem with angle adjustment in throttle Output of the engine temperature sensor Increased air through a damaged intake manifold problem with an electronic control unit
Methods for solving problems Diagnostics of this problem requires some knowledge, because in the process can be affected by irreparable damage to the engine. Therefore, it is necessary to carefully read the instructions for the operation of this car. It is also important to remember that the injectory gasoline engines are installed on the car of Chevrolet, therefore, the elevated idling turnover on the heated engine is most likely the electronic components of the car. Checking the idling sensor for this engine warms up to operating temperature. Then only to check the sensor using a multimeter. When malfunction must be replaced with a new one. The throttle position sensor This component is responsible for the amount of air mixture entering the engine combustion chamber. If the sensor is configured incorrectly, the fuel granted fuel will be harder to detonate, quickly spinning the engine and increasing turns. Checking the sensor is also made using a multimeter.
Problems with throttle valve. These problems are similar to the failure of the throttle sensor and lead to the same consequences. Only the main problem here is not electronic - but pollution of the damper itself falling out of crankcase with pairs of oils, residues of combustion products or due to a rare air filter change. If there are pollution trails, you must clean the damper. To do this, you need to completely remove the throttle knot and either replace it with damage or clean with special means. It is important to remember that after cleaning, an angle of throttle valve may be invalid, due to the so-called "memory effect" in the ECU. In this case, on some models it will be necessary to conduct additional computer diagnostics. Engine temperature sensor. This component is most often conclusing because it is constantly exposed to highly high temperatures. Therefore, in some cases it is better to start finding problems with it. It is also checked using a multimeter. After replacement, it may be necessary to clean the ECU errors.
Damage to the intake manifold. It may fail and the collector himself, if the car has a sufficiently large resource. But more often fails. In this case, excess air superstar occurs. To solve the problem, it is necessary to dismantle this item, as well as the nodes on which injection elements are located. Before installing the gasket, it is necessary to carefully polish the surface of the collector and clean it from the traces of the old gasket. But it is important to remember that the emergence of this problem is accompanied by not only increased turnover at idle. Damage to the gasket leads to the fact that the engine launch becomes complicated, turns at the time of movement.
Which is necessary to maintain the combustion process of fuel in the cylinders at the minimum level, that is, the engine continue to work and not Gloh. On the different motors The idling turnover may differ, and also depend on the temperature of the internal combustion engine. In case of increasing the indicated turns of the XX, the engine begins to spend more fuel, exhaust in this mode becomes more toxic. Lowering idle turns leads to unstable work power aggregate, as well as to the fact that the motor begins to stall after the release of the gas pedal. In this article, we will talk about what the reason for the high speed of the engine at idle can be the reason why high idling turns on a warm engine are found on many cars, as well as consider the basic ways to diagnose this malfunction.
Read in this article
High engine speed at idle: injector
The turnover and operation of the motor on the XX actually means that the air is fed into the engine into the throttle bypass. In other words, at idle the specified damper is blocked. It should be noted that the idle course is normal for different aggregates is about 650-950 rpm. In parallel with this frequent malfunction, it is that in the heated engine, the turns of the XX are held at about 1500 rpm and higher. Such an indicator is a sign of a malfunction to be eliminated.
It should also be noted such a phenomenon when "floating" idling turnover, that is, for example, increase to 1800 rpm, after which it is dropped to 750 and rises again. Very often increased turnover of XX and floating momentums are the result of the same breakdowns. Let's take a look at petrol aggregate with an injector as an example. In such an engine, the engine turnover depend on the amount of suction air. It turns out that the throttle is preserved, the more air enters the intake manifold. Then determines the amount of incoming air, parallel takes into account the opening angle of the throttle (the position of the throttle valve) and a number of other parameters, after which the corresponding amount of gasoline is supplied.
If the computer does not have accurate information about the number of air due to problems, then the following will occur: the controller will first raise the turnover enriching the mixture (more fuel is supplied). Then, with such a quantity of fuel and an additional amount of air, which does not know the computer, the mixture will be dismissed, and the motor will start working unstable or can almost stumble. In other words, the turnover will begin to fall on too poor mixture. The reduction of revolutions means that the amount of air absorbed by the air unit also decreases. At a certain point, the composition of the mixture (the ratio of fuel and air) will again be optimal, as a result of which the turns will rise again and then start falling or "swim". The cause of such the work of the DVS It may be out of order or working with interruptions. You should also consider the possible air intake climbers.
Another case is such when the engine holds idling speed of about 1500-1900 rpm, while working smoothly, the turns do not swim. In this case, it can be assumed that the injector gives so much fuel in XX mode, which is enough to work on such high revolutions. In other words, there is a fuel overrun. These features can be characteristic of single engines and absent on others, as there is a dependence on the device of a particular injection system (aggregates with air-circuit meter, motors with a pressure sensor in the intake manifold). Obviously, the air seats is frequent cause Increase the speed of the engine or floating turns on the XX.
Now let's deal with where the excess air can enter the inlet. Looking for a problem in four main directions:
- throttle;
- channel XX;
- device to maintain "warm-up" revolutions;
- servomotor forced increase in XX;
As for the first case, the opening of the throttle is controlled by the gas pedal. At idle, the motor should work without pressing the accelerator. It should be borne in mind that on many cars the gas pedal is mechanical, that is, it is connected to the opening mechanism of the flap with a conventional cable. If this zakus cable is broken or pulled, and there are problems with the mechanism itself, then there may be a banal effect of pressing the gas pedal. In this case, the engine will keep high speed, as the ECU believes that the driver is rigged to the accelerator and the damper is a bit open.
In the second case, excess air can pass through the idle channel. Such a channel is available on the overwhelming majority of injection engine. The specified air channel goes to bypass the throttle and is called the idling channel. In the implementation of the scheme there is a special adjustment screw. With this screw, you can change the channel cross-section, increasing or reducing the amount of air flowing into the engine and adjust the turns of the XX.
Another place where air sawmake is possible is a device that supports high speed at idle during HRS warm-up. If simply, there is a separate air channel, which has a solution for its overlap after the engine warming (rod or damper). In the device for overlapping there is a sensitive thermoelement. In many units, the specified element interacts with antifreeze in, like. On the hot engine, the device is triggered in such a way that the stock shifts completely or the flap turns to such an angle to completely block the channel for supplying additional air.
As a result, the ECU is calculated by the amount of air, reduces the amount of fuel supplied and turns down. If the cool motor, this channel is initially open. In this case, the ECU receives indications from the temperature sensor and enriches fuel mixture. Radic problems may arise as a result of failure this deviceand after failures of the temperature sensor.
Completes the list of special servo equipment - the idling regulator, which is installed in a separate air channel. This decision is able to forcibly increase idle turns. In various schemes, it can be an electric motor, a solenoid, option electromagnetic valve etc. The main task of such a regulator is to ensure the smoothness of the engine transition to the XX mode after the release of the gas pedal. In other words, the engine does not sharply resets the turnover after closing the throttle, and gradually. Another function of the device is to increase idle speed at the time of engine start, and then their smooth decrease to the necessary. Also, the regulator raises turnover after increasing the load on the engine in idle mode (switching on the climatic installation, heating seats or mirrors, long or dipped headlights, overall lights etc.). The failure of this device will naturally entail an increase in or swimming in idling mode.
Increased XX turns on motors with carburetor
At the very beginning, we note that the increase in XX turns on carburetor engines is often associated with the dosing device itself. If high engine speed at idle is noted in the case of a carburetor motor, then the reasons may be several.
- The first cause is a beatened idle adjustment. Such adjustment is carried out using an adjusting screw that allows you to enrich or drench the mixture. To solve the problem, it is necessary to properly adjust the idling on the carburetor.
- It should also be paid to the fact that the air damper may not be fully opened on the carburetor cars.
- Another place to be paid to the attention is the valve of the first chamber in the carburetor. The specified flap may not be closed until the end due to defects of the damper itself or incorrectly adjusted drive.
- Finally, add that in the carburetor float chamber can be observed a noticeable increase in the level of fuel, which also leads to an increase in idle turns.
That in the end
It should be noted that the problem of idling on the engine with an injector is diagnosed by checking the main systems that are responsible for the flow of air in the engine, as well as the change in the composition of the mixture, taking into account the amount of incoming air. It turns out, it should be taken into account that the failure of individual ECM sensors can lead to an increase or floating turnover of XX.
In the general list of the main reasons for which idolotes can increase on the injector, allocate: no power regulator, DPDZ, power unit temperature sensor, problems with the opening of the throttle opening control mechanism, air intake. We add that before in-depth diagnostics, it follows to start the procedure for cleaning the throttle damper, as the dirty choke is a frequent cause of increased revolutions or unstable operation of the motor at idle.
Read also
Why periodically need to clean the throttle. How to clean the damper, learning and adaption of the throttle after cleaning, useful tips.
